title: 5-(6-Amino-1,3-dimethyl-2,4-dioxo-1,2,3,4-tetra-hydropyrimidin-5-yl)-1,3-dimethyl-1H-chromeno[2,3-d]pyrim-idine-2,4(3H,5H)-dione 3.5-hydrate.
abstract: The title compound, C19H19N5O5·3.5H2O, crystallizes with 3.5 mol-ecules of water in the asymmetric unit, one of which lies on a mirror plane. One of the water mol-ecules links the mol-ecules, forming centrosymmetric dimers. These dimers are then linked through further N-H⋯O and O-H⋯O hydrogen bonding, leading to the observed three-dimensional structure.
authors.affiliation: Department of Chemistry, National Institute of Technology-Agartala, Pin-799055, Tripura, India.
authors.forename: Subhadip
authors.initials: S
authors.lastname: Roy
authors.forename: Subrata
authors.initials: S
authors.lastname: Das